It was already more than 2 months from the last time Auron used Alice's self-created spell. He knew that it was just a waste of time if he insisted on using the spell. He lacked the necessary knowledge as a mage.
However, Auron didn't forget about it. Instead, he put it as one of his short term goals. Auron knew that he needed to increase his understanding of elemental first, especially the fire element, before he could proficiently use the spell.
There was still a long way to go before he could achieve that, though. However, Auron already excited before he was one step closer.
But that excited feeling only lasted for a brief. Auron immediately shifted back his mind to the nearest one, the new assignment.